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Yes, move the other fish to another tank. Stress from the first pair means that others are not eating well and becoming stunted. I doubt that you can keep 2 pairs in a 30x21x20"/75x50x50cm tank; definitely not in a 30x21x20 cm tank. If you plan to breed this species, it is unlikely that you will succeed in a well-planted tank; water values will favor the fish and not the plants, or vicaversa.
Although I believe there aren't any submerged plants in Ivanacara's natural habitat, and it won't be an aquascape, I think you can.
There are a number of plants that will grow at very low pH, hardness and nutrient levels. In fact some plants like Syngonanthus, Tonina, Eriocaulon and Brasenia are only really growable long term in "black water" conditions.
I moved two I. Adoketa this morning in the other tank, i will try to sell it because i don't have enough place for them.
In another tank, i have 6 apistogramma veil fleck….
It hard for me to move them, because the water don't have the same parameter. I acclimate them to the new one again, but without substrate they look stress. I take 70% of water of my tank and switch in the hospital tank. (mine is 55G and hospital 15G)
I need to move the big tank in 2-3 months, currently my tap water is 7 ph 0 kh and 0 gh. Where i move, the tap water is around 7 ph but the kh and gh is hard more than 5. I will need to mix osmose water with the tap water or only amond leave will do the job ?
I don't believe that you can have a tank that is too large for this species. It might be more difficult to concentrate food for the fry in such a large tank, but the water quality will remain higher (more stable) for a longer time. Cardinal tetras are infamous fry predators. You will lose many (if not most) of your fry to them. Pencilfish would be a better option.
I think that if you treat the water with sphagnum peat, you will lower the pH and dKH adequately. As for pencilfish in Qubec, I don't know. Does any LFS buy from Below Water in Montreal?